在 Rails 4.1 中，如何通过枚举符号查找记录? [英] In Rails 4.1, how to find records by enum symbol?

问题描述

假设我有这个模型:

class Conversation < ActiveRecord::Base
  enum status: [ :active, :archived ]
end

如何在不使用枚举的数值或无需遍历每个对话的情况下找到所有活动对话?

How can I find all active conversations without using the numeric value of the enum or without having to iterate over each conversation?

我尝试了 Conversation.where(status: :active)，但没有产生任何结果.

I tried doing Conversation.where(status: :active), but it didn't yield any results.

想到的唯一解决方案是遍历所有对话并选择活动对话，但这看起来不是一个好的解决方案.

The only solution comes to mind is to iterate over all conversations and select the active ones, but it doesn't look like a good solution.

Conversation.all.select {|conversation| conversation.active? }  

我能对此做些什么吗?

推荐答案

ActiveRecord::Enum 根据其值提供范围.

试试吧:

Conversation.active

或

Conversation.archived

当然，您可以创建自己的范围，如 Kyle Decot 所述.

Of course, you can create your own scopes as Kyle Decot mentioned.

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